<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types/data';
import { onMounted, onUnmounted, PropType, ref } from 'vue';
// 接收父组件传过来的数据
const props = defineProps({
  slides: {
    type: Array as PropType<BannerItem[]>,
    required: true,
  },
  autoPlay: {
    type: Boolean,
    default: false,
  },
  duration: {
    type: Number,
    default: 3000,
  },
})
// 控制小圆点高亮
const active = ref(0)
// 控制左右箭头切换
const prev = ()=>{
    if(active.value <= 0){
        active.value = props.slides.length - 1
    }else{
        active.value--
    }
}
const next = ()=>{
    if(active.value >= props.slides.length - 1){
        active.value = 0
    }else{
        active.value++
    }
}
// 控制自动播放
let timerId = -1
onMounted(()=>{
//    timerId =window.setInterval(()=>{
//         next()
//     },1000)
// 直接调用play方法即可
    play()
})
// 关闭组件时，清除定时器
onUnmounted(()=>{
    // clearInterval(timerId)
    // 直接调用stop方法即可
    stop()
})

// 鼠标移入，停止自动播放，鼠标移出，继续自动播放
const play = ()=>{
    // 判断如果没有传自动播放的属性，则不开定时器
    if(!props.autoPlay) return
    // 开启定时器
    timerId =window.setInterval(()=>{
        next()
    },props.duration) // 接收传过来的定时器时间
}
const stop = ()=>{
    clearInterval(timerId)
}

</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="play">
    <ul class="carousel-body">
      <li class="carousel-item" v-for="(item,index) in slides" :key="item.id" :class="{fade:active === index}">
        <RouterLink :to="item.hrefUrl">
          <img
            :src="item.imgUrl"
            alt=""
          />
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev"
      @click="prev"><i class="iconfont icon-angle-left"></i
    ></a>
    <a href="javascript:;" class="carousel-btn next"
      @click="next"><i class="iconfont icon-angle-right"></i
    ></a>
    <div class="carousel-indicator">
      <span :class="{active:active === index}" v-for="(item,index) in slides" :key="item.id" @mouseenter="active = index"></span>
    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
